[pandas_test] C:\Miniconda3-32\Scripts>python
Python 2.7.11 |Continuum Analytics, Inc.| (default, Jan 29 2016, 15:36:56) [MSC v.1500 32 bit (Intel)] on win32
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>>> import numpy as np
>>> np.__version__
'1.9.2'
>>> np.abs(np.array([0,np.nan],dtype='float64'))
__main__:1: RuntimeWarning: invalid value encountered in absolute
array([  0.,  nan])
>>>